Muck Boot Hale Multi-Season Kids' Rubber Boot Synthetic Rubber sole Shaft measures approximately 9" from arch Boot opening measures approximately 12" around 4 mm neoprene provides comfort and flexibility, along with excellent waterproofing, shock absorption and heat retention properties; adjusts to the contours of your foot to resist blisters and chafing 100% waterproof kids' boots are suitable for any season and any outdoor activity; 10-inch height offers excellent protection Lightweight and breathable mesh lining keeps feet well ventilated for long-wearing dryness; comfort rated from sub-freezing to 65 F/18 C Self-cleaning ribbed outsole offers added stability on slick surfaces; outsole wraps around for additional traction and grip Rear pull tab and wide opening allows for easy on-off